Experimental data on the number of neutrons born in the heavy water targets of the large neutrino detectors are used to set the limit on the proton life-time independently on decay mode through the reaction d -> n+?. The best up-to-date limit tau_p > 4 10^23 yr with 95% C.L. is derived from the measurements with D_2O target (mass 267 kg) installed near the Bugey reactor. This value can be improved by six orders of magnitude with future data accumulated with the SNO detector containing 1000 t of D_2O.
@article{arxiv.nucl-ex/0104011,
title = {Experimental limits on the proton life-time from the neutrino experiments with heavy water},
author = {V. I. Tretyak and Yu. G. Zdesenko},
journal= {arXiv preprint arXiv:nucl-ex/0104011},
year = {2008}
}